Influences of Eddy Current in Magnetic Drive Pump and Parameter Selection

Magnetic drive pump eddy current inside and outside the magnetic rotor in the coupling rotation, placed inside and outside the rotor between the static state of the isolation sleeve metal wall thickness of the cross-section cut alternating magnetic field lines generated in the sleeve wall section The magnetic effect of eddy current and the emergence of the thermal effect is called eddy current.

The influence of eddy The process of eddy current generation is called the super-skin effect process. On the one hand weakened the work of the magnetic field, reducing the transmission of force or torque, on the other hand produce eddy current losses in the form of heat to release energy consumption of the original motivation (energy), reduce work efficiency, metal isolation sleeve seal magnetic transmission During normal operation, due to the generation of eddy currents, continuous release of heat, magnetic materials, the working environment temperature rising, the temperature rises to a nominal temperature, the magnet's magnetic properties as the temperature continues to increase and reduce the magnetic properties The force or torque transmitted will affect the normal operation of the magnetic device. When the temperature rises to the Curie temperature of the magnetic material, the magnetic property of the magnetic material completely disappears, ie, the working function of the magnetic actuator completely fails to generate eddy current loss Factor analysis and the choice of parameters 1 Theoretical and experimental results show that the size of the magnetic eddy current loss and the thickness of the isolation sleeve t, to meet the requirements of isolation sleeve strength conditions, the isolation sleeve wall thickness as small as possible.

2 the size of the loss of magnetic eddy current and insulation sleeve material у proportional relationship. Conductivity, eddy current loss, so the choice of conductivity sleeve isolation material is appropriate.

3 The size of the magnetic loss is proportional to the magnitude of the magnetic field and the third power of the magnetic field r, and proportional to the square of the magnetic length. Structural design to minimize the r value, appropriate to increase the value of L, is conducive to control or reduce eddy current losses. This is because the larger the value of r, the higher the speed of rotation of the magnet rotor, resulting in an alternating magnetic field in the isolation sleeve have a great impact, so to meet the design requirements under the premise of the main engine speed should not choose high.

The above discussion and analysis show that the metal shield in the magnetic actuator generates eddy current to cause power loss, as long as the size of the eddy current can be effectively controlled or the eddy current loss can be reduced to a minimum by properly selecting the parameters and the permanent magnet material.

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